This patch accounts for the time Xen steals from our VCPUs. Stolentime is time where a vcpu is runnable and could be running, but allavailable physical CPUs are being used for something else.

This accounting gets run on each timer interrupt, just as a way to getit run relatively often, and when interesting things are going on.Stolen time is not really used by much in the kernel; it is reportedin /proc/stats, and that's about it.